SP322 datasheet(11/13 Pages) SIPEX

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SP322DS/06

SP322 V.11/V.35 Serial Transceiver

Rev. 7/9/03

SP322 V.11/V.35 Serial Transceiver

Termination Circuitry

Unique to Sipex, the SP322 provides internal

resistor networks for V.35 as well as the cable

termination for V.11. The resistor network for

the V.35 receivers are configured as a typical

V.35 receiver using two 51

Ω resistors in series

tied to the A and B inputs with a 124

Ω center-tap

resistor to ground. The network is internally

switched on during V.35 mode (V.11/V.35 =

CC) using high performance, low rON transis-

tors. The transistors can operate efficiently over

+7V to -7V, and can tolerate over +10V to -10V

without damage. This termination provides the

proper V.35 receiver input impedance of 100

Ω

and short-circuit impedance at 2V of 150

Ω with

10% accuracy.

The configuration for the V.11 receiver input

resistor network is similar to the V.35 network

except that the 124

Ω resistor is disconnected

(V.11/V.35 = 0V). A series resistor is also

added increase the input impedance to over

120

Ω for the V.11 cable termination.

The

minimum resistance per the ITU V.11 specifica-

tion is 100

Ω. The V.11 termination can be

switched off using the V.11_TERM pin. For a

terminated V.11 receiver, this pin is at a logic

"1".

A logic "0" will inform the switches to

disconnect the V.11 termination.

Shutdown

The SP322 includes a shutdown pin (SD) which

disables the charge pump and all power con-

suming circuitry to provide low I

CC. A logic "1"

to the SD pin will shut down the SP322 where it

will draw less than 20

µA of current.

NET1/2 European Compliancy

As with all of Sipex's previous multi-protocol

transceiver ICs, the SP322 drivers and receivers

have been designed to meet all electrical

specifications for ITU V.11 and V.35.

Furthermore, it is internally tested and will pass

the NET1/2 physical layer testing requirements.

Please note that although the SP322 adheres to

NET1/2 testing, any complex or unusual

configuration should be double-checked to

ensure NET compliance. Consult factory for

details.

Applications Information

The SP322 is designed for serial port applica-

tions needing V.11 and V.35 transceivers. The

SP322 supports a variety of physical layer

protocols such as EIA-530, EIA-530A, RS-449,

and V.36 where V.11 transceivers are used for

clock and data signals. The termination resistors

are recommended for crosstalk and reflections

elimination under higher speed operation.

Internal termination solves many headaches and

configuration hassles with implementing V.11

and V.35. The SP322 provides a simple, low-

cost solution for the clock and data lines for

synchronous serial ports. The handshaking lines

such as CTS, DTR, etc. can be implemented

using discrete RS-422 or RS-232 transceivers,

depending on the mode supported. Sipex

supplies either differential (V.11) or single-

ended (V.28) discrete transceiver products

to mate with the SP322.

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